mineral

Sunstone (Feldspar variety)

Oligoclase or Andesine (Na,Ca)(Al,Si)4O8

Hardness: 6–6.5 on Mohs scale. Color: Orange, reddish-brown, or gold with a metallic glitter (schiller). Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions. Specific gravity: 2.62–2.67.

Hardness: 6–6
Luster: Vitreous to pearly

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks like basalt flows or plutonic rocks like pegmatites. The aventurescence is caused by tiny hematite or copper inclusions that align during cooling. Geological age varies greatly by location, from Cenozoic to Precambrian.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and faceted stones) and as a collector specimen. Occasionally used in ornamental carvings.

Geological facts

The 'schiller' effect (metallic shimmer) is the most famous feature of sunstone. Oregon Sunstone is a unique variety that contains tiny inclusions of pure copper, making it the official state gemstone of Oregon.

Field identification & locations

Identify in the field by its distinct orange-red body color and the characteristic 'sparkle' when rotated under light. Commonly found in Oregon (USA), Norway, India, and parts of East Africa. Collectors should look for clear transparency with dense copper/hematite platelets.

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